Is there a way to find which websites are the most often linked to or cited in good quality answers on Stack Exchange?

The problem I'm trying to solve is: given a website which I know nothing about its quality, I would like to know how reliable it is. One measure that came to my mind is how often it is used in accepted and upvoted answers on Stack Exchange.

PS: besides the number of upvotes and downvotes for an answer, which other criterion could be used for estimate how good an answer is ? StackExchange is probably using internally the reputation of voters, but we don't have access to this info, right ?